Sounds like a line impedance problem, (channel is "singing/howling") 
possibly-
ancillary dialer (gypsy code dialer for alternate ld provider)
line has  "line extender" on it
line is on a subcriber carrier card.
line is on T1 with wrong impedance setting (600/900/1200)

does it do it on another co port? does it happen with nothing but a 2500 
slt connected to the co?
 
-larry




Steve Klein wrote:

>This is a quite loud line noise (heard through the handset), just prior to
>dialtone -- it is significantly louder than normal talk volume. It really
>startles people using our system if they aren't ready for it.
>
>--Steve
>  
>


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